Navigation Links
New models may reduce seabird bycatch
Date:4/4/2011

DURHAM, N.C. Tens of thousands of albatrosses and other far-ranging seabirds are killed each year after they become caught in longline fishing gear. Innovative new models developed by a Duke University-led research team may help reduce these casualties by more precisely projecting where and when birds and boats are likely to cross paths.

The models use remotely sensed physical and biological data to predict changing conditions such as sea surface temperatures or the availability of phytoplankton that make different parts of the ocean suitable habitats for foraging, nesting and other seabird behaviors at different times of the year, or from year to year.

Conservationists and fisheries managers can overlay maps of predicted habitat suitability onto maps of longline fishing activity and telemetry-tracked bird migrations to better avoid bird bycatch.

Old bycatch models don't account for these dynamic factors; they rely almost exclusively on static overlays based on historic fishery and bird-tracking data.

The Duke-led team tested the new models in case studies of two species of pelagic seabirds, the Laysan albatross and the black-footed albatross, whose long-distance migrations intersect areas of heavy swordfish and tuna fishing activity in Hawaiian fisheries. The studies used historic bycatch and tracking data from 1997 to 2000. Results were published March 23 online in the British peer-reviewed journal Proceedings of the Royal Society B.

The models' predictions corresponded closely to actual historic bycatch observations, says lead researcher Ramunas Zydelis, a postdoctoral research associate at Duke's Center for Marine Conservation. Black-footed albatrosses were more frequently caught in 1997-2000 despite being 10 times less abundant than Laysan albatrosses, probably because their habitat overlapped more with fisheries, according to the model's predictions.

Zydelis says the findings demonstrate that the new models "may be especially useful in cases where seabird tracking data do not fully represent the population" or reflect the full extent of its current or potential geographic range.

For instance, the models predicted suitable habitats for Laysan albatrosses along the California Current in the eastern Pacific, despite the fact that none of the birds tracked in the study traveled there, he says. Conservationists who relied on old, static models wouldn't have been forewarned about possible bycatch interactions in that region, even though Laysan albatrosses are known to forage in the current's rich waters.

The models also predicted suitable habitats for black-footed albatrosses from July to October in the Sea of Okhotsk in the northwest Pacific, though no recent tracking data suggests the species' distribution extends that far.

One possible explanation, says co-author Larry B. Crowder of Duke, may be that huge numbers of black-footed albatrosses were hunted and killed for their feathers in that region during the 19th and early 20th centuries, effectively wiping out the modern population, even though archeological evidence suggests the birds were widespread there in pre-modern times.

"Whether the models have correctly identified potential or recent black-footed albatross range is unknown," says Crowder, director of the Center for Marine Conservation and Stephen Toth Professor of Marine Biology at Duke's Nicholas School of the Environment. "Nevertheless, it underscores the potential for dynamic models to provide new information on animal distribution."


'/>"/>

Contact: Tim Lucas
tdlucas@duke.edu
919-613-8084
Duke University
Source:Eurekalert

Related biology news :

1. Models of eel cells suggest electrifying possibilities
2. Swamping bad cells with good in ALS animal models helps sustain breathing
3. New movement models tested at the Smithsonian in Panama
4. Models simulate nitrate dynamics in Garonne, Southwest France
5. David Rose to present Howe School lecture on new technologies and business models, Jan. 29
6. Bacteria are models of efficiency
7. New models question old assumptions about how many molecules it takes to control cell division
8. Disease Models & Mechanisms -- selected for indexing in Medline
9. CSHL team develops mouse models of leukemia that predict response to chemotherapy
10. Crop models help increase yield per unit of water used
11. REGiMMUNE presents enhanced efficacy data in preclinical transplantation models
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/3/2016)... May 3, 2016  Neurotechnology, a provider of ... MegaMatcher Automated Biometric Identification System (ABIS) , a ... projects. MegaMatcher ABIS can process multiple complex biometric ... combination of fingerprint, face or iris biometrics. It ... and MegaMatcher Accelerator , which have ...
(Date:4/19/2016)... -- The new GEZE SecuLogic access control ... system solution for all door components. It can be ... interface with integration authorization management system, and thus fulfills ... dimensions of the access control and the optimum integration ... considerable freedom of design with regard to the doors. ...
(Date:3/31/2016)... , March 31, 2016   ... ("LegacyXChange" or the "Company") LegacyXChange is excited ... of its soon to be launched online site for ... https://www.youtube.com/channel/UCyTLBzmZogV1y2D6bDkBX5g ) will also provide potential shareholders a ... DNA technology to an industry that is notorious for ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... (PRWEB) , ... June 23, 2016 , ... ... is pleased to announce the launch of their brand, UP4™ Probiotics, into Target ... over 35 years, is proud to add Target to its list of well-respected ...
(Date:6/23/2016)... 23, 2016 A person commits a crime, and ... to track the criminal down. An outbreak of ... Drug Administration (FDA) uses DNA evidence to track down the ... Sound far-fetched? It,s not. The FDA has increasingly used a ... of foodborne illnesses. Put as simply as possible, whole genome ...
(Date:6/23/2016)... , June 23, 2016  The Prostate Cancer Foundation (PCF) is ... treatments and faster cures for prostate cancer. Members of the Class of 2016 ... countries. Read More About the Class of 2016 PCF ... ... ...
(Date:6/23/2016)... ... ... Supplyframe, the Industry Network for electronics hardware design and ... in Pasadena, Calif., the Design Lab’s mission is to bring together inventors and ... brought to market. , The Design Lab is Supplyframe’s physical representation of one ...
Breaking Biology Technology: